[Aerroon]

Gestures wildly at the 20th century.

Or a more recent example would be the "misinformation craze" we had going on since years ago. That seems to have fallen away when it became apparent that many fact checkers were politically aligned.

The concept of "memes" in a more general sense is a counterargument too. Viral ideas are precisely a way of one person spreading their perspective to tens of millions.

You could even argue that the current AI bubble building up is a hype cycle that went out of control.

These are all examples of very few people impacting the beliefs of millions.